Electric-dipole, electric-quadrupole, magnetic-dipole, and magnetic-quadrupole transitions in the neon isoelectronic sequence - art. no. 012507

Excitation energies for 2l-3l' hole-particle states of Ne-like ions are det ermined to second order in relativistic many-body perturbation theory (MBPT ). Reduced matrix elements, line strengths, and transition rates are calcul ated for electric-dipole (E1), magnetic-quadrupole (E2), magnetic-dipole (M 1), and magnetic-quadrupole (M2) transitions in Ne-like ions with nuclear c harges ranging from Z = 11 to 100. The calculations start from a 1s(2)2s(2) 2p(6) closed-shell Dirac-Fock potential and include second-order Coulomb an d Breit-Coulomb interactions. First-order many-body perturbation theory (MB PT) is used to obtain intermediate-coupling coefficients, and second-order MBPT is used to determine the matrix elements. Contributions from negative- energy states are included in the second-order E1, M1, E2, and M2 matrix el ements. The resulting transition energies are compared with experimental va lues and with results from other recent calculations. Trends of E1, E2, M1, and M2 transition rates as functions of nuclear charge Z are shown graphic ally for all transitions to the ground state.